Don't use the __attribute__((packed)) on most platforms.

It won't necessarily work with non-GCC-compatible compilers, so use it
only on GCC-compatible compilers.

Even with some GCC-compatible compilers (such as, err, umm, GCC), it
doesn't do the right thing on some platforms, e.g. 64-bit SPARC, where
the compiler generates code that assumes alignment even when using it.
The only platforms I know of where an unaligned big-endian load can be
done better than by loading bytes and shifting-and-ORing them together
are MIPS and possibly Alpha, so only do it there.

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